<template>
  <div>
    <h1>当前求和为:{{ sum }}</h1>
    <h3>当前求和放大10倍为:{{ bigSum }}</h3>
    <h3>我在{{ school }},学习{{ subject }}</h3>
    <select v-model.number="n">
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
    </select>
    <button @click="increment">+</button>
    <button @click="deincrement">-</button>
    <button @click="incrementOdd">当前求和为奇数再加</button>
    <button @click="incrementWait">等一等再加</button>
  </div>
</template>

<script>
import { mapState, mapGetters } from "vuex";
export default {
  name: "Count",
  data() {
    return {
      n: 1,
    };
  },
  computed: {
    //靠程序员自己亲自去写计算属性
    /* he() {
      return this.$store.state.sum;
    },
    xuexiao() {
      return this.$store.state.school;
    },
    xueke() {
      return this.$store.state.subject;
    }, */
    //借助mapState生成计算属性,从state中读取数据.(对象写法)
    // ...mapState({ he: "sum", xuexiao: "school", xueke: "subject" }),
    //借助mapState生成计算属性,从state中读取数据.(数组写法)
    ...mapState(["sum", "school", "subject"]),
    /* bigSum() {
      return this.$store.getters.bigSum;
    }, */
    //借助mapGetters生成计算属性,从getters中读取数据.(对象写法)
    // ...mapGetters({ bigSum: "bigSum" }),
    //借助mapGetters生成计算属性,从getters中读取数据.(数组写法)
    ...mapGetters(["bigSum"]),
  },
  methods: {
    increment() {
      this.$store.commit("JIA", this.n);
    },
    deincrement() {
      this.$store.commit("JIAN", this.n);
    },
    incrementOdd() {
      this.$store.dispatch("jiaOdd", this.n);
    },
    incrementWait() {
      this.$store.dispatch("jiaWait", this.n);
    },
  },
  mounted() {
    // console.log("Count", this);
    //
    // const x = mapState({ he: "sum", xuexiao: "school", xueke: "subject" });
    // console.log(x);
  },
};
</script>

<style scoped>
button {
  margin-left: 5px;
}
</style>